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https://issues.apache.org/jira/browse/KAFKA-3719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan P reopened KAFKA-3719:
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I would like to re-open this topic for discussion. While [~gwenshap] is
correct, underscores are not valid hostnames per RFC-952 and RFC-1123.
However they are still valid domain name characters per RFC-2181.
"The DNS itself places only one restriction on the particular labels
that can be used to identify resource records. That one restriction
relates to the length of the label and the full name. The length of
any one label is limited to between 1 and 63 octets. A full domain
name is limited to 255 octets (including the separators). The zero
length full name is defined as representing the root of the DNS tree,
and is typically written and displayed as ".". Those restrictions
aside, any binary string whatever can be used as the label of any
resource record."
So while technically this underscores do violate the standard put in place for
hostnames we could stand to be a tad more lenient given the relaxed set of
standards for use with domain names. I personally feel that the flexibility in
naming conventions outweighs the cost of strict standards compliance.
Source:
https://tools.ietf.org/html/rfc2181#section-11
> Pattern regex org.apache.kafka.common.utils.Utils.HOST_PORT_PATTERN is too
> narrow
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-3719
> URL: https://issues.apache.org/jira/browse/KAFKA-3719
> Project: Kafka
> Issue Type: Bug
> Reporter: Balazs Kossovics
> Priority: Trivial
>
> In our continuous integration environment the Kafka brokers run on hosts
> containing underscores in their names. The current regex splits incorrectly
> these names into host and port parts.
> I could submit a pull request if someone confirms that this is indeed a bug.
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